Historically, rocket munitions have always been more effective when fired in swarms. From the 15th century Korean Hwatcha rocket propelled arrow launcher to the MLRS or Grad rockets of today to the Itano Circus prevalent in ’80s Sci-Fi anime- and by extension, BattleTech. Rocket swarms can be brutally effective- if a not very efficient means of hitting your target. But those are artillery type weapons. Equipment covered in BattleTech by Arrow IV Missiles. What about something closer in?
The mainstay of western rocket direct-fire weapons for the past 60 years has been the Hydra 70 2.75″ (70mm) rocket pod. The Hydra rocket series weighs in at a hair over 6 kg, has an effective range of 8,000 meters and has an absolutely ridiculous selection of warheads to choose from (19 from the Wikipedia list). White Phosphorus, Flechette, cluster munition, HE, smoke, you name it.